This indicates an attack attempt to exploit a Memory Corruption vulnerability in Adobe Flash Player.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted SWF file that contains malformed regular expressions. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted SWF file.
Adobe Flash Player 11.7.700.169 and prior versions on Windows and Macintosh
Adobe Flash Player 184.108.40.2060 and prior versions on Linux
Adobe Flash Player 220.127.116.11 and prior versions on Android 4.x
Adobe Flash Player 18.104.22.168 and prior versions on Android 3.x and 2.x
Adobe AIR 22.214.171.1240 and prior versions on Windows and Macintosh
Adobe AIR 126.96.36.1990 and prior versions on Android
Adobe AIR 188.8.131.520 SDK & Compiler and prior versions
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.